System of directed reception for wireless-telegraphy stations.



E. BELLINI & A. TOSI. SYSTEM OF DIREGTED RECEPTION FOR WIRELESS TELEGRAPHY STATIONS.

APPLICATION FILED JUNE 16, 1908.

Patented Jan.4,1910.

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SYSTEM OF DIRECTED RECEPTION FOR WIRELESS-TELEGRAIHY STATIONS.

Specification of Let r n Patented Jan. 4, 1910.

Original application filed October'l, 1907, Serial No. 395,366. Divided and thisapplication filed June 16,

1908. Serial .T 0 'all who-m it-may concern:

I Be it known that We, Errors". BELLINI and Annssiinnno TOSI, subjects of Italy, residing at 4 Rue du 29 J uillet, Paris, in the Republic of France, have invented new and useful Improvements in Systems of Directed Reception for Wireless-Telegraph Stations, of which the following is a specification. Our invention relates to a system or wire less telegraphy or system employing the energy under the form of electromagnetic waves, which permits a receiving station aerials to communicate in all directions without it being necessary either to turn the dirigible aorials, which is not applicable in practice, onto employ a great number of dirigible aerials, which is very complicated and has besides inconveniences as regards the working. By the term. "dirigible aerial we mean any aerial conductor having the property of radiating or receiving waves with different intensities according to the different directions. closed oscillation circuit, or a pair of antennae connected together by a conductor constitute respectively a dirigible aerial.

To describe the parts ofour invention, we have supposcdthat it is applied to the case in whiclrthc dirigible aeria-ls are closed oscillation. circuits, but of course all the parts of the installation are applicable in the same manner, to the other dirigihle aerials.

This application is a division of an ap lication filed October 1, 1907, Serial &0. 395,366.

In the annexed drawing, Figure 1 rcpre-' sents a diagrammatic perspective partial view of a receiving station according to our invention comprising two dirigible acrials. Figs. and are diagrammatic plan views showing the devices enabling communication to be insured in anydirection, without causing the dirigible acrials to turn.

As is well known, a directed Wireless tclcg-g raphy station must generally be capable of communicating in any given direction. Up to now, it has been necessary for this purpose either to turn the aerial according to the direction of the transmitting station, or 1 lo arrange a great number of dirigible aerials in the difierent directions According to our invention it is on the contrary possible to communicate in any given direc tion with a very small number of dirigible i acrials (two for instance) and Without causing the aerials to turn. We employ for this purpose two or more dirigible aerials in a fixed position, which act all at the same time on a detector, but each with an intensity dcpending on the angle formed by its plane with the direction of the transmitting station. The partial actions of the various dirigible aerials are received by a special ceiviug apparatus which composes them into a sole resultant, the direction of which depends on that of the transmitting station.

We haveshown in the drawing two different arrangements which We may employ to realiiae the purpose set forth. In both cases, we have supposed that the dirigiblc aerials were constituted by two closed oscillation circuits of triangular shape A B 'B A and A B B A arranged respectively in two perpendicular planes.

According to the first arrangement (Figs. 1 and we employ in combination with said dirigible aerials an apparatus of the inductive excitation type composed of two fixed coils in and n perpendicular one to each other. Each coil iis connected rcspeo tively,to one "of the diri'gible aerials through terminals 6 b and b b. A third coil 8 is placed within the free space between the coils m and n and is capable of rotating about the axis 0 or intersection of the median planes of the coils in and n. It is connected to the Wave detector (Z which may be of anytype: we have shown as example an electrol'tic detector. 0 represents a condenser, 7') t a battery, and t the telephone receiver. When-the waves reach. the station, the two closed oscillation circuits forming the aerial are influenced at the same time and conseently oscillating currents are produced in tie circuits and in the coils m and n. The intensities of said currents depend on the mngles formed by the direction of the trans initting station with the planes of said circuits. Each coil produces inwardly a magnetic field proportionate to its current intensity and the two fields compose themselves into a sole resulting field the direction of which is perpendicular to that of the transmitting station. This field acts upon the movable coil 8 in which an electromotive force maximum will take place when the lane of its Windin will be perpendicular to said resulting eld, that is to say, when the median plane of the coil will be di mitting rccted toward the transmitting station. In this position the reception will reach its [maximum Therefore, when the position of the movable coil which ives the maximum reception will be reache three results will be obtained: a.To receive from the station with which it isdesired to communicate. b.Not' to receive from other stations eventually at work and which are situated out of the plan which unites the stations in communication and the receiving station. c.-To determine the direction of the transstation from'which the signals are received.

In the second arrangement illustrated in Fig. 3 the apparatus employed; is of the direct excitation type. It is. constituted by a continuous spiral wound on a torus. The points I) Z) and Z) 6' Of the aerial Circuits, instead of being connected to the coils m and n of the foregoing apparatus, are connected to the points a a and a a of'the,

torus at the ends of two perpendicular diameters. Two brushes f f insulated one from the other and invariably fixed at 180 may rotate in continuous contact with the torus, about the axis 0 by means of rings 9 g and contact pieces h it. The brushes are connected to the wave detector which may be of any kind and which in the drawing is shown diagrammatically as being of the same kind as that-of the Fig. 2 The circuit of'the detector at is in this cdse excited directly by two aerials, circuits. The direct excitation, as is known, is at the same time a magnetic and galvanic excitation, the magnetiCvv excltation being far superior to the galvanic. The winding of the torus works like an autotransformer By causing the position of the brushes f f to be varied, the degrees of connectionbetween th'eeircuit of the detector and each aerial circuit are varied. When the brushes f are arranged according to a a, the degreeof connection is maximum for the aerial connected to the points a. a and null for theother. ;A reverse anaiog'eus action takes place when the brushes are arranged according-to a 0/. When a transmitting station .is in the direction a a or a a the maximum effect upon the detector will take place when the brushes will be arranged according to a a or according to a a. When a transmitting station is in intermediate direction between a a and a a, it will be necessary to arrange the brushes in an intermediate position be- V tween a a and a a to have the maximu of reception, the osition of the brush having a determine relation with the direction' of the transmitting station. Consequently when the position of the diameter of the brushes which gives the maximum reception will be ascertained, the same three results hereinbefore described will be ob tained.

Having now described our invention what we claim as new and desire to secure by Letters Patent'is:

Asystem of directed reception for wireless telegraphy stations comprising for the aerial partof the receiving station several dirigible aerials in a fixed position, combined with fixed" windings inserted in the conducting part of the aerials, with a wave detector, and with a rotary device connected to. the detector and influenced by'the currents which traverse the fixed windings, substantially as, described and for the purpose set forth. In testimony whereof we have 'signed our names to this specification in the two subscribing witnesses.

ETTORE BELLINI. ALESSANDRO TOST \Vitnesses DEAN MASON, ALNTOINE Litvoix.

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